Enter Host name and Save session fields with Login address and browse Connection - SSH - Auth menu. The Host Name input may be in the format "username@clustername.it4i.cz" so you don't have to type your login each time.In this example we will connect to the Salomon cluster using "salomon.it4i.cz".

Now you can insert additional public key into authorized_keys file for authentication with your own private key.
You must log in using ssh key received after registration. Then proceed to How to add your own key.